Okay, I've had this before and I fixed it before, but I can't remember how.
The CDROM on my Indigo 2 will only recognize the original install media for IRIX 6.5. All other media gets an error, including the overlay CDs. I fixed this before by taring/zipping the overlay CDs for 6.5.17 and FTPing them and installing them. Then the CDROM magically worked fine.
I am now in a post-harddrive crash state and find myself in the same predicament again. But this time, not even FTPing will work. When I drag the untared/unzipped DIST directories into the software manager, it swears that the directory contains no products. I try directly dragging the *.SW files in, but it says that the file is "bad".
Any help would be appreciated.